Multiblock copolymers based on poly(p-phenylene)-co-poly(arylene ether sulfone ketone) with sulfonated multiphenyl pendant groups for polymer electrolyte fuel cell (PEMFC) application

Yoon, Kyung Seok; Lee, Jang Yong; Kim, Sang Woo; Yu, Duk Man; Hong, Sung Il; Hong, Young Taik

doi:10.1016/j.eurpolymj.2015.01.021

Cited by 27 publications

(5 citation statements)

References 26 publications

(30 reference statements)

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“…, low current density range) as reported by others. , However, the MEA with CM-50 shows larger cell voltages from the current density ranges of 0.6 to 1.8 A cm –2 due to the larger proton conductivity of CM-50, resulting in lowering the membrane resistance under the MEA operation. Furthermore, since Nafion 212 could be highly influenced by the mass transfer limitations in the high current density ranges above 0.8 A cm –2 , a drastic decrease in cell voltage values of Nafion 212 was observed as reported before. ,, Therefore, a larger maximum power density value of the MEA employing CM-50 (0.70 W cm –2 ) than that employing Nafion 212 (0.58 W cm –2 ) can be obtained from our preliminary MEA performance test. The cell performance of the MEA employing CM-50 was found to be better than and/or comparable to those employing SHPs reported before, as shown in Table S4.…”

Section: Resultssupporting

confidence: 75%

“…Furthermore, since Nafion 212 could be highly influenced by the mass transfer limitations in the high current density ranges above 0.8 A cm −2 , a drastic decrease in cell voltage values of Nafion 212 was observed as reported before. 15,46,57 Therefore, a larger maximum power density value of the MEA employing CM-50 (0.70 W cm −2 ) than that employing Nafion 212 (0.58 W cm −2 ) can be obtained from our preliminary MEA performance test. The cell performance of the MEA employing CM-50 was found to be better than and/or comparable to those employing SHPs reported before, as shown in Table S4.…”

Section: Introductionmentioning

confidence: 85%

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Simple and Effective Cross-Linking Technology for the Preparation of Cross-Linked Membranes Composed of Highly Sulfonated Poly(ether ether ketone) and Poly(arylene ether sulfone) for Fuel Cell Applications

Lee

Han

Ahn

et al. 2020

ACS Appl. Energy Mater.

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Cross-linking technology has been considered as one of the effective strategies for improving the physicochemical stability of proton-exchange membranes (PEMs) for fuel cell applications. However, the complicated procedure, which consists of various reagents and multiple steps to form the proton-conducting cross-linked membranes, has been known to be disadvantageous to increasing the application of the cross-linking method. In this study, we present a simple and effective cross-linking technology for the development of high-performance cross-linked PEMs without any tedious chemical processes and catalysts or additives. A series of cross-linked membranes could be prepared by a simple one-step stage of casting and heating the mixture of sulfonated poly(ether ether ketone) (SPEEK) and sulfonated poly(arylene ether sulfone) (SPAES) in dimethyl sulfoxide (DMSO) solution, where DMSO works as the solvent and the reagent at the same time without any tedious chemical reaction steps. By controlling the cross-linking density, cross-linked membranes having tunable physicochemical stabilities and mechanical properties with outstanding proton conductivity could be obtained. The fuel cell performance of the membrane electrode assembly employing the cross-linked membrane with the optimum cross-linking density and composition ratio showed a maximum power density of 0.70 W cm −2 , which was superior to that employing Nafion 212 (0.58 W cm −2 ) at 80 °C under fully humidified H 2 /air condition.

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Section: Resultssupporting

confidence: 75%

Section: Introductionmentioning

confidence: 85%

Simple and Effective Cross-Linking Technology for the Preparation of Cross-Linked Membranes Composed of Highly Sulfonated Poly(ether ether ketone) and Poly(arylene ether sulfone) for Fuel Cell Applications

Lee

Han

Ahn

et al. 2020

ACS Appl. Energy Mater.

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“…Therefore, the available H + and Fe 2+ cations also cross the membrane from feed side to dialysate side in order to meet the electrically neutral requirements. H + ions are transported much more extensively compared to Fe 2+ ion due to their small size and lower valence state [56,57].…”

Section: Acid Recovery Performance Of Qdab Aems Via Diffusion Dialysis (Dd)mentioning

confidence: 99%

Quaternized Diaminobutane/Poly(vinyl alcohol) Cross-Linked Membranes for Acid Recovery via Diffusion Dialysis

et al. 2021

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Diffusion dialysis (DD) using anion exchange membranes (AEM) is an effective process for acid recovery and requires the preparation of suitable materials for AEMs, characterized by unique ions transport properties. In this work, novel AEMs composed of quaternized diaminobutane (QDAB) and poly(vinyl alcohol) (PVA) were cross-linked by tetraethoxysilane (TEOS) via the sol–gel process. The prepared AEMs were systematically characterized by Fourier-transform infrared (FTIR) spectroscopy, ion-exchange capacity (IEC) analysis, thermo gravimetric analysis (TGA), water uptake, linear expansion ratio (LER), and mechanical strength determination, scanning electron microscopy (SEM), and DD performance analysis for acid recovery using a hydrochloric acid/iron chloride (HCl/FeCl2) aqueous mixture and varying the QDAB content. The prepared AEMs exhibited IEC values between 0.86 and 1.46 mmol/g, water uptake values within 71.3 and 47.8%, moderate thermal stability, tensile strength values in the range of 26.1 to 41.7 MPa, and elongation from 68.2 to 204.6%. The dialysis coefficient values were between 0.0186 and 0.0295 m/h, whereas the separation factors range was 24.7–44.1 at 25 °C. The prepared membranes have great potential for acid recovery via diffusion dialysis.

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“…Over the last few decades, hydrocarbon-based ionomers have been regarded as the most promising alternatives to Nafion because of their high ionic conductivity, low vanadium permeability, and low cost, even though their chemical stability issue is still unresolved. , Considering that IEM is exposed to extremely harsh conditions in a VRFB single cell, the chemical stability of IEM materials has been regarded as an overarching property. − In accordance with the impressive studies of many passionate researchers, the electrophilic attack of active radicals on the electron abundant moieties is the main cause of chemical degradation of hydrocarbon-based ionomers. − That is, the chemical stability of flexible hydrophilic moieties or blocks with ether or sulfide bonds significantly affects the chemical degradation of IEM materials. − Therefore, various research groups have investigated hydrocarbon-based ionomers with rigid hydrophilic blocks such as sulfonated poly( p -phenylene)s and sulfonated poly(arylene sulfone)s, which have led to considerable progress in the domain of hydrocarbon-based ionomers for VRFBs. − Nevertheless, hydrocarbon-based ionomers are limited by their insufficient chemical stability, which suggests that there is likely another issue that affects the chemical stability of ionomers.…”

Section: Introductionmentioning

confidence: 99%

Structural Effect of the Hydrophobic Block on the Chemical Stability of Ion-Conducting Multiblock Copolymers for Flow Battery

Hong

Suc

Hong

et al. 2019

ACS Sustainable Chem. Eng.

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Four sulfonated poly(p-phenylene)-based ionomer materials with different hydrophobic block structures are synthesized in order to investigate the effect of the hydrophobic block structure on the durability of ionomer membrane in vanadium redox flow batteries (VRFBs). The structural differences of the hydrophobic blocks scarcely affect the physical, electrochemical, and morphological properties of the block copolymer-type ionomers. On the contrary, according to an ex situ soaking test and an in situ VRFBs cell test, the structural differences of the hydrophobic block greatly affect the chemical stability of the ionomer membranes. Among the four ionomers, the sPP-b-PSK membrane shows outstanding cell performance (Coulombic efficiency of 99.3% and energy efficiency of 72.6%) as well as excellent chemical stability even after long-term operation of 2 000 cycles. These results are conceptually helpful for designing chemically stable ionomers.

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Multiblock copolymers based on poly(p-phenylene)-co-poly(arylene ether sulfone ketone) with sulfonated multiphenyl pendant groups for polymer electrolyte fuel cell (PEMFC) application

Cited by 27 publications

References 26 publications

Simple and Effective Cross-Linking Technology for the Preparation of Cross-Linked Membranes Composed of Highly Sulfonated Poly(ether ether ketone) and Poly(arylene ether sulfone) for Fuel Cell Applications

Simple and Effective Cross-Linking Technology for the Preparation of Cross-Linked Membranes Composed of Highly Sulfonated Poly(ether ether ketone) and Poly(arylene ether sulfone) for Fuel Cell Applications

Quaternized Diaminobutane/Poly(vinyl alcohol) Cross-Linked Membranes for Acid Recovery via Diffusion Dialysis

Structural Effect of the Hydrophobic Block on the Chemical Stability of Ion-Conducting Multiblock Copolymers for Flow Battery

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